JPH0248374B2 - HODENDENATSUKENSHUTSUSOCHI - Google Patents
HODENDENATSUKENSHUTSUSOCHIInfo
- Publication number
- JPH0248374B2 JPH0248374B2 JP3598584A JP3598584A JPH0248374B2 JP H0248374 B2 JPH0248374 B2 JP H0248374B2 JP 3598584 A JP3598584 A JP 3598584A JP 3598584 A JP3598584 A JP 3598584A JP H0248374 B2 JPH0248374 B2 JP H0248374B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- discharge
- electrode
- gap
- workpiece
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims description 13
- 238000009760 electrical discharge machining Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Description
【発明の詳細な説明】
産業上の利用分野と従来技術
本発明は、放電加工における電極とワーク間の
電圧を測定検出する放電電圧検出方式に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application and Prior Art The present invention relates to a discharge voltage detection method for measuring and detecting the voltage between an electrode and a workpiece in electrical discharge machining.
放電加工装置の電極とワーク間のギヤツプ電圧
を測定するには直接電極とワーク間の電圧を測定
すればよいが、電極とワークは相対的に移動する
ため、該電極またはワークへ接続するためのリー
ド線が長くなり、その結果、どうしても浮遊イン
ダクタンスが生じることとなる。このため、大電
流を流し、放電加工を行う場合には、この電流の
立上り、立下りが大きくなり、上記浮遊インダク
タンスの影響が出て、電極、ワーク間のギヤツプ
電圧を精確に判定できないという現象が生じる。
例えば、第１図は、放電加工における電極とワー
ク間のギヤツプ電圧を検出測定する従来の検出装
置であるが、Ｅは電源部、Ｐは電極、Ｗはワー
ク、Ｒ１，Ｒ２は抵抗で、Ｌは上記ワークＷと電
極Ｐ間のリード線等による浮遊インダクタンスを
示しており、電極ＰとワークＷ間のギヤツプ電圧
を分圧回路Ｄの抵抗Ｒ１，Ｒ２で分圧し、端子Ｔ
１，Ｔ２からギヤツプ電圧の測定電圧VGを得て
いる。このような装置によつて電極ＰとワークＷ
間に大電流の放電電流I1を流し、放電加工を行う
場合にギヤツプ電圧を検出測定しようとすると、
放電電流I1の立上り、立下りが大きいため、浮遊
インダクタンスＬの影響が出て精確なギヤツプ電
圧の測定電圧波形VGが得られない。第２図に大
電流を流したときのギヤツプ電圧測定説明図を示
すが、第２図１はワークＷと電極Ｐ間に電圧を印
加する期間を示し、第２図２は放電電流I1の波形
を示し、第２図３において、ａは端子Ｔ１，Ｔ２
間に生じるギヤツプ電圧の測定電圧波形VGを示
す。そこで、第２図１に示すように、ワークＷと
電極Ｐ間に電圧を印加し、第２図２に示すよう
に、ワークＷと電極Ｐ間に放電電流I1が流れる
と、端子Ｔ１，Ｔ２間の測定電圧波形VGは、第
２図３のａで示すような電圧波形が得られる。し
かし、ワークＷと電極Ｐのギヤツプに電圧が印加
され、放電が開始する以前は該ギヤツプ電圧は高
く、放電が開始されるとギヤツプ電圧は低下する
から、実施のギヤツプ電圧の波形は第２図３のｂ
に示すような波形でなくてはならない。しかし、
上記したように、放電電流の立上り、立下り時に
浮遊インダクタンスの影響が出て、端子Ｔ１，Ｔ
２間で測定するギヤツプ電圧波形は第２図３のａ
のような波形となつてしまい、正確なギヤツプ電
圧を得ることができない。 To measure the gap voltage between the electrode and workpiece in electrical discharge machining equipment, it is sufficient to directly measure the voltage between the electrode and workpiece, but since the electrode and workpiece move relative to each other, it is necessary to The lead wires become long, which inevitably results in stray inductance. Therefore, when electrical discharge machining is performed by flowing a large current, the rise and fall of this current become large, and the influence of the above-mentioned stray inductance appears, making it impossible to accurately determine the gap voltage between the electrode and the workpiece. occurs.
For example, Fig. 1 shows a conventional detection device that detects and measures the gap voltage between an electrode and a workpiece in electrical discharge machining.E is a power supply, P is an electrode, W is a workpiece, R1 and R2 are resistors, and L indicates the stray inductance due to the lead wire etc. between the workpiece W and the electrode P, and the gap voltage between the electrode P and the workpiece W is divided by the resistors R1 and R2 of the voltage dividing circuit D, and the voltage is applied to the terminal T.
1. The gap voltage measurement voltage V G is obtained from T2. With such a device, the electrode P and the work W
If you try to detect and measure the gap voltage when performing electrical discharge machining by passing a large discharge current I1 between the
Since the rise and fall of the discharge current I1 are large, the influence of the stray inductance L occurs, making it impossible to obtain an accurate measurement voltage waveform VG of the gap voltage. Fig. 2 shows an explanatory diagram of gap voltage measurement when a large current is applied. Fig. 2 1 shows the period during which voltage is applied between the workpiece W and the electrode P, and Fig. The waveforms are shown in FIG. 2 and 3, a indicates the terminals T1 and T2.
The measured voltage waveform V G of the gap voltage that occurs between the two is shown. Therefore, as shown in FIG. 2, when a voltage is applied between the workpiece W and the electrode P, and a discharge current I1 flows between the workpiece W and the electrode P, as shown in FIG. The measured voltage waveform V G between T2 has a voltage waveform as shown in a of FIG. 2. However, before a voltage is applied to the gap between the workpiece W and the electrode P, the gap voltage is high before the discharge starts, and when the discharge starts, the gap voltage decreases. Therefore, the waveform of the actual gap voltage is shown in Figure 2. 3b
The waveform must be as shown in . but,
As mentioned above, the influence of stray inductance appears at the rise and fall of the discharge current, and the terminals T1 and T
The gap voltage waveform measured between 2 and 3 is a in Fig. 2.
This results in a waveform like , and it is not possible to obtain an accurate gap voltage.
以上のように、従来の放電電圧検出装置におい
ては、特に放電電流が大電流になると正確なギヤ
ツプ電圧を検出測定することができないという欠
点があつた。 As described above, the conventional discharge voltage detection device has the disadvantage that it is not possible to accurately detect and measure the gap voltage, especially when the discharge current becomes large.
発明の目的
本発明は、従来技術の欠点を改善し、大電流を
流し、放電加工を行う場合でも精確なギヤツプ電
圧を検出測定し得る放電電圧検出装置を提供する
ことを目的としている。OBJECTS OF THE INVENTION An object of the present invention is to improve the drawbacks of the prior art and to provide a discharge voltage detection device that can accurately detect and measure gap voltage even when a large current is applied and electrical discharge machining is performed.
発明の構成
本発明は、放電加工装置の電圧を分圧回路を介
して測定する放電電圧検出装置において、放電回
路中に放電電流を検出するコイルを設け、該放電
電流の立上り及び立下りに該コイルに発生する電
圧を上記分圧回路に入力して、上記放電回路中の
浮遊インダクタンスによつて上記放電電流の立上
り及び立下りにより発生する電圧による測定電圧
への影響を消すようにしたことを構成とする放電
電圧検出装置である。Structure of the Invention The present invention provides a discharge voltage detection device that measures the voltage of an electrical discharge machining device via a voltage dividing circuit, in which a coil for detecting a discharge current is provided in the discharge circuit, and the rise and fall of the discharge current is detected. The voltage generated in the coil is input to the voltage divider circuit, and the stray inductance in the discharge circuit eliminates the influence on the measured voltage due to the voltage generated by the rise and fall of the discharge current. This is a discharge voltage detection device configured as follows.
実施例
第３図は、本発明の一実施例で、第１図の従来
例と同一構成のものは同一符号を付しており、相
違点はワークＷと電極Ｐ間の流れる放電電流I1を
検出するコイルＣを設け、該コイルＣが放電電流
I1を検出して発生する電圧を抵抗Ｒ３とギヤツプ
電圧を分圧した分圧回路Ｄの抵抗Ｒ２で分圧し、
浮遊インダクタンスＬの影響を排除するように接
続する。Embodiment FIG. 3 shows an embodiment of the present invention. Components having the same structure as the conventional example shown in FIG . A coil C is provided to detect the discharge current.
The voltage generated by detecting I 1 is divided by resistor R3 and resistor R2 of voltage divider circuit D that divides the gap voltage.
Connect so as to eliminate the influence of stray inductance L.
このような放電電圧検出装置における放電電圧
検出について、第４図の放電電圧検出説明図を参
照しながら説明する。 Discharge voltage detection in such a discharge voltage detection device will be explained with reference to the discharge voltage detection explanatory diagram of FIG. 4.
第４図１は、第２図１と同様ワークＷと電極Ｐ
間に電圧が印加される期間を示す。同２は放電電
流I1、同３は端子Ｔ１，Ｔ２間の測定されるギヤ
ツプ電圧の測定電圧波形、同４は放電電流I1によ
り発生したコイルＣの電圧波形を示すもので、ま
ず、ワークＷと電極Ｐ間に第４図１に示すように
電圧が印加されると、放電が生じる前は端子Ｔ
１，Ｔ２間には第４図３に示すようにギヤツプ電
圧による高電圧が生じる。そして、第３図２に示
すように放電が生じ放電電流I1が流れると、ギヤ
ツプ電圧は抵抗し、第４図３に示すように端子Ｔ
１，Ｔ２間の電圧は低下する。この際、コイルＣ
には放電電流I1の微分（dI1／dt）に比例した電
圧が発生するが、この電圧を抵抗Ｒ３とＲ２で分
圧し、かつ、浮遊インダクタンスＬの影響が消え
るように極性を逆にして第４図４に示すように端
子Ｔ１，Ｔ２間に発生させる。その結果、浮遊イ
ンダクタンスＬによつて生じた電圧（第２図３の
ａとｂの差）は、コイルＣによつて放電電流の立
上り、立下りで発生する電圧によつて消され、第
４図３に示すように精確なギヤツプ電圧を得るこ
とができる。なお、抵抗Ｒ３の値は充分大きくす
ることによつて分圧回路Ｄの抵抗Ｒ１，Ｒ２の分
圧比に影響しないようにすることができ、また、
浮遊インダクタンスＬの影響を排除するような値
に実験的に決められる値である。 FIG. 4 1 shows the workpiece W and electrode P as in FIG. 2 1.
Indicates the period during which a voltage is applied. 2 shows the discharge current I 1 , 3 shows the measured voltage waveform of the gap voltage measured between terminals T1 and T2, and 4 shows the voltage waveform of the coil C generated by the discharge current I 1 . When a voltage is applied between W and electrode P as shown in FIG.
As shown in FIG. 4, a high voltage is generated between T1 and T2 due to a gap voltage. Then, when a discharge occurs and a discharge current I1 flows as shown in FIG. 3, the gap voltage resists, and as shown in FIG.
The voltage between T1 and T2 decreases. At this time, coil C
A voltage proportional to the differential (dI 1 /dt) of the discharge current I 1 is generated, but this voltage is divided by resistors R3 and R2, and the polarity is reversed so that the influence of the stray inductance L disappears. 4. As shown in FIG. 4, it is generated between terminals T1 and T2. As a result, the voltage generated by the stray inductance L (the difference between a and b in FIG. 2 and 3) is erased by the voltage generated by the coil C at the rise and fall of the discharge current, and the As shown in FIG. 3, an accurate gap voltage can be obtained. Note that by making the value of the resistor R3 sufficiently large, it is possible to prevent it from affecting the voltage dividing ratio of the resistors R1 and R2 of the voltage dividing circuit D.
This is a value determined experimentally to eliminate the influence of stray inductance L.
発明の効果
本発明は、簡単な構成によつて、放電回路の浮
遊インダクタンスによるギヤツプ電圧の測定電圧
に対する影響を排除できたから、大電流による放
電加工においても、精確なギヤツプ電圧の検出が
でき、放電加工の精度及び加工スピードを向上さ
せることができるものである。Effects of the Invention The present invention has a simple configuration that eliminates the influence of the stray inductance of the discharge circuit on the measurement voltage of the gap voltage. Therefore, even in electrical discharge machining using a large current, the gap voltage can be accurately detected and the discharge This makes it possible to improve machining accuracy and machining speed.
第１図は、従来の放電電圧検出装置、第２図
は、同放電電圧検出装置におけるギヤツプ電圧測
定説明図、第３図は、本発明の一実施例、第４図
は、同一実施例のギヤツプ電圧測定説明図であ
る。
Ｐ……電極、Ｗ……ワーク、Ｄ……分圧回路、
Ｃ……コイル、Ｌ……浮遊インダクタンス、Ｅ…
…電源部、Ｒ１，Ｒ２，Ｒ３……抵抗。
Fig. 1 is a conventional discharge voltage detection device, Fig. 2 is an explanatory diagram of gap voltage measurement in the same discharge voltage detection device, Fig. 3 is an embodiment of the present invention, and Fig. 4 is a diagram of the same embodiment. FIG. 3 is an explanatory diagram of gap voltage measurement. P... Electrode, W... Work, D... Voltage dividing circuit,
C... Coil, L... Stray inductance, E...
...Power supply section, R1, R2, R3...Resistor.
Claims (1)
する放電電圧検出装置において、放電回路中に放
電電流を検出するコイルを設け、該放電電流の立
上り及び立下りに該コイルに発生する電圧を上記
分圧回路に入力して、上記放電回路中の浮遊イン
ダクタンスによつて上記放電電流の立上り及び立
下りにより発生する電圧による測定電圧への影響
を消すようにしたことを特徴とする放電電圧検出
装置。1. In a discharge voltage detection device that measures the voltage of an electrical discharge machining device via a voltage dividing circuit, a coil for detecting a discharge current is provided in the discharge circuit, and the voltage generated in the coil at the rise and fall of the discharge current is detected. Discharge voltage detection characterized in that the influence on the measured voltage due to the voltage input to the voltage divider circuit and generated by the rise and fall of the discharge current due to the stray inductance in the discharge circuit is eliminated. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3598584A JPH0248374B2 (en) | 1984-02-29 | 1984-02-29 | HODENDENATSUKENSHUTSUSOCHI |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3598584A JPH0248374B2 (en) | 1984-02-29 | 1984-02-29 | HODENDENATSUKENSHUTSUSOCHI |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60180719A JPS60180719A (en) | 1985-09-14 |
| JPH0248374B2 true JPH0248374B2 (en) | 1990-10-24 |
Family
ID=12457158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3598584A Expired - Lifetime JPH0248374B2 (en) | 1984-02-29 | 1984-02-29 | HODENDENATSUKENSHUTSUSOCHI |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0248374B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07112647B2 (en) * | 1986-12-11 | 1995-12-06 | フアナツク株式会社 | Electric discharge machine |
| JP2522685B2 (en) * | 1988-02-03 | 1996-08-07 | ファナック株式会社 | Wire cut gap voltage detector |
-
1984
- 1984-02-29 JP JP3598584A patent/JPH0248374B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60180719A (en) | 1985-09-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |